Happened to me too...I had the old cap ending in .00 and replaced it with a cap ending in .01. Never happened since and it has been 3 months now. I also did notice the water level in the coolant tank was slowly going down. The new cap fixed all of the problems. The cap will run you $20 or so and is worth changing regardless! Good luck!
Paul
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2000 Porsche Boxster S
2007 Lexus RX350
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